Oxford University has slipped in the ­international league table of the world's top universities - in a study which shows the advance of academia in Asia that will soon pose a challenge to the Ivy League and Oxbridge.

The study, from Times Higher Education and QS Top Universities shows that overall the UK still punches above its weight, second only to the US. The UK has four out of the top 10 slots and 18 in the top 100. But there has been a significant fall in the number of North American universities in the top 100, from 42 in 2008 to 36 in 2009.

However, the number of Asian universities in the top 100 increased from 14 to 16. The University of Tokyo, at 22, is the highest ranked Asian university, ahead of the University of Hong Kong at 24.

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